The 1.3 GHz SRF injector cryomodule for VECC - designed and manufactured at TRIUMF

Transcription

1 Canada s National Laboratory for Particle and Nuclear Physics Laboratoire national canadien pour la recherche en physique nucléaire et en physique des particules The 1.3 GHz SRF injector cryomodule for VECC - designed and manufactured at TRIUMF M. Ahammed 2, D. Kishi 1, P. Kolb 1, A. Koveshnikov 1, R. Laxdal 1, Y. Ma 1, M. Mondal 2, N. Muller 1, R. Nagimov 1, V. Naik 2, S. Saha 2, V. Zvyagintsev 1 1 TRIUMF Vancouver, Canada 2 VECC- Kolkata, India Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Research Council Canada Propriété d un consortium d universités canadiennes, géré en co-entreprise à partir d une contribution administrée par le Conseil national de recherches Canada

2 Outline: Introduction TRIUMF ARIEL project e-linac Injector Cryomodule 4K/2K cryogenic insert Cryogenic insert test Test insert overview Test diagnostics 4K/2K Test results Syphon loop performance Summary 2

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4 The 530 MeV Cyclotron at TRIUMF: The World s Cyclotron Largest Cyclotron construction Built in

5 TRIUMF s International Cooperation 5

6 TRIUMF s International Cooperation ICM2 Status Timeline 6

7 TRIUMF and e - -linac Electron driver for photo-fission: independent and complementary to 500 MeV cyclotron Composed of five elliptical cavities at 1.3 GHz Final specification 50 MeV/10mA ->0.5 MW beam power, cw by 2018 (cash flow dependent) Injector cryomodule (ICM 1) - designed, built and tested as part of ongoing collaboration with VECC Staged installation: MeV and 3 ma Injector cryomodule (ICM 2) - designed, built and tested as part of ongoing collaboration with VECC kW 50kW 50kW 25MeV 50kW 50kW 50MeV Gun 10MeV 50kW Injector kW kW Driver 50kW kW 7 7

8 Injector Cryomodule Heat exchanger 4K separator Houses one nine-cell 1.3GHz cavity Two 50kW power coupler Strong back 2K separator 2K separator Power coupler tuner cavity Features 4K/2K heat exchanger unit with JT valve on board expand LHe from 1.2bar to 30mbar Scissor tuner with warm motor Two layers of mu metal warm and cold WPM based alignment Stainless steel ribbed tank with hatches for access 8

9 Injector Cryomodule Heat exchanger 4K separator Houses one nine-cell 1.3GHz cavity Two 50kW power coupler Strong back 2K separator 2K separator Power coupler tuner cavity Features 4K/2K heat exchanger unit with JT valve on board expand LHe from 1.2bar to 30mbar Scissor tuner with warm motor Two layers of mu metal warm and cold WPM based alignment Stainless steel ribbed tank with hatches for access 9

10 Cryogenic Circuits 77K Supply 4K intercepts syphon circuits 4K Supply 4K Return JT Valve 2K Return Cooldown Valve 4K Cooldown 77K Exhaust Cryogenic insert with 4K phase separator JT valve and heat exchanger on board to produce 2K liquid Allows stand alone testing from any 4K refrigerator Insert is removable with cryomodule in situ 4K intercepts cooled by siphon circuit from 4K reservoir Cooldown circuit for initial cooling LN2 cooled thermal shield 10

11 Cryoinsert design Design enables prototyping and testing of cryoinsert in existing test cryostat 4k supply valve regulates 4K level JT valve regulates 2K level 2K exhaust valve regulates 2K pressure (temperature) JT & Control valves (WEKA) 4K GHe return 4K LHe supply Mounting flange Heat exchanger (DATE) 4K reservoir 11

12 TRIUMF s ISAC SRF Cryogenics Upgrade 12

13 TRIUMF s ISAC SRF Cryogenics Upgrade 13

14 TRIUMF s ISAC SRF Cryogenics Upgrade 14

15 Cryogenic insert Design 4K/2K cryoinsert Cryoinsert was tested in the test cryostat before installation in the cryomodule 2K Test Load Injector Cryomodule 141MHz Test Cryostat 15

16 Cryogenic insert Design 4K/2K cryoinsert Cryoinsert was tested in the test cryostat before installation in the cryomodule 2K Test Load Injector Cryomodule 141MHz Test Cryostat 16

17 2K LHe production Procedure 4K reservoir Cooldown Valve TS7 H1 H3 LVL1 TS1 TS4 H2 LVL2 TS5 TS2 TS3 P TS8 Heat exchanger JT Valve 2K reservoir Establish and regulate levels and temperatures in both 4K and 2K reservoirs Set calibrated heater power in 2K reservoir Close 4K supply valve and record falling level Record 4K falling level for various heater settings up to maxim mass-flow rate for 2K pumps TS6 H4 H5 17

18 4K/2K Diagnostics Temperature sensors 6 diodes and 2 CERNOX Level probes one each for 4k and 2k reservoirs Heaters one for each reservoir and one for each siphon load GM P1 P3 P2 TS1 TS2 Heat exchanger TS8 H1 LVL1 TS4 LVL2 TS3 4K reservoir JT Valve Cooldown Valve TS7 H3 H4 H5 TS6 H2 TS5 2K reservoir Intercept loads 18

19 The Syphon loop cooldown interface flange Objective was to optimize the choice of materials, joint technology, dimensions, parallel loop interference Temperature sensor F. Visentin, COMSOL Conference 2009, Milan Wednesday LHe tube Heater Temperature sensor add heater power ----nucleate boiling --- density of two-phase liquid decrease---flow 19

20 Critical heater power q cr W 1 = cm ( L/ D) L length = 48 cm D diameter = 0.78 cm A- - - area = 12 cm Q cr 2 W 2 * The critical heater power is about 2W for total nucleate boiling. *Lehongre, S., et al., "Critical nucleate boiling of liquid helium in narrow tubes and annuli," in Proceedings of the second International Cryogenic Engineering Conference 2, edited by Scripta,Ilife Science, 1968, pp

21 4K/2K siphon circuit test results Test 1 Measured 4K siphon circuit efficiency extra heat load caused by convection in 4K reservoir ~15-20W Test 2 after modifying siphon circuit siphon loop now well behaved with static load of 1.6W 35 Additional siphon exhaust guidetube and Teflon funnel in 4K reservoir drastically drops convective load 4K static load (W) After modification Before modification Heater power (siphon) (W) 21

22 4K/2K siphon circuit test results Test 1 Measured 4K siphon circuit efficiency extra heat load caused by convection in 4K reservoir ~15-20W Test 2 after modifying siphon circuit siphon loop now well behaved with static load of 1.6W 35 Additional siphon exhaust guidetube and Teflon funnel in 4K reservoir drastically drops convective load 4K static load (W) After modification Before modification Heater power (siphon) (W) 22

23 4K/2K Cryogenics unit test summary 4K static load (W) After modification Before modification Heater power (siphon) (W) Test 1 Measured static load of 4K (2W) and 2K (0.5W) reservoirs Measured efficiency of 2K conversion of 66% at 0.5 g/s mass flow Measured 4K siphon circuit efficiency extra heat load caused by convection in 4K reservoir ~15-20W Test 2 after modifying siphon circuit siphon loop now well behaved with static load of ~1.6W Proved the concept in large Have established the dimensional parameters for syphon loops Narrowed down materials choice and joints type Verified the absence of cumulative negative effects of parallel syphon circuits on cryoinsert performance 23

24 Multi-cell cavity test The cavity was then assembled in the clean room and prepared for cold test in the new multicell cryostat The test confirmed the operation of the cryostat (vacuum, diagnostics, static load) and rf system (rf variable coupler and cables) 24

25 Outline of e-linac cryogenic system Cold Box Accelerator CM Injector CM 25

26 ICM1 Assembly ICM mock-up 2013 Mock-up assembly of ICM used to test parts and procedures Final assembly (aided by lessons learned from mockup) - completed in <1 month Cavity hermetic unit (March 14, 2014) Top assembly into tank ICM top assembly ICM unit Complete (April 9, 2014) 26

27 ICM1 Cold test results Parameter Estimated Measured 4K static load (no syphon) 2 3 4K static load with syphon K static load K static load 100 <130 2K production efficiency 82% 86% Cryogenic engineering matches design expectations Syphon loop performance characterized works well optimized in off-line cryostat tests Efficiency (%) Mass Flow (g/s) Temp (K) K Production efficiency Active Load (W) Heat Exchanger Temp. (degk) Mass flow (g/s) Active Load (W) 27

28 ICM2 Assembly Top Lead Assembly(Nov, 2015) Top Lead Assembly(Dec, 2015) ICM2 Hermetic Unit (Jan, 2016) ICM 2 Cold test, Cold Alignment, Transfer to e-hall, RF tests, Beam tests, etc. ICM2 Buttoned Up (Feb, 2016) ICM2 Vacuum Leak test (Last week) Today and forward 28

29 ICM Cryogenic Design Summary The 4K/2K cryogenic insert assembly has been tested successfully and proved for installation in the ARIEL Injector cryomodule The static load of the system has been measured The Maximum 2K production efficiency is about 77% for 1.1gm/sec mass flow. Siphon loop performance has been improved by adding a funnel loop in 4K reservoir to reduce the convection load. 29

30 ICM 2 Summary The 2K/4K cryoinsert tests have demonstrated the validity of our design approach The ICM1 and ACM Uno cold tests have demonstrated that the cryoengineering is robust and matches specifications Having e-linac infrastructure in place saves time and efforts on the test infrastructure for ICM2 Plan to accomplish the cold test, RF test and the beam test for ICM2 in nearest few months 30

31 Canada s national laboratory for particle and nuclear physics Laboratoire national canadien pour la recherche en physique nucléaire et en physique des particules Thank you! TRIUMF: Alberta British Columbia Calgary Carleton Guelph Manitoba McMaster Montréal Northern British Columbia Queen s Regina Saint Mary s Simon Fraser Toronto Victoria York Merci! Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Research Council Canada Propriété d un consortium d universités canadiennes, géré en co-entreprise à partir d une contribution administrée par le Conseil national de recherches Canada